十万个为什么·科学启蒙30篇（2）

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萤火虫如何发出冷光？

Fireflies make light through a chemical reaction called bioluminescence, not heat.
A substance called luciferin reacts with oxygen, aided by an enzyme named luciferase.
This process releases almost all its energy as visible light, not infrared heat.
Because very little heat is produced, scientists call it 'cold light'.
Each firefly species flashes a unique pattern to attract mates in the dark.
Scientists study this reaction to develop safer medical imaging tools for humans.
Unlike light bulbs, firefly light needs no electricity and creates zero waste heat.
Researchers have even inserted firefly genes into plants to make them glow softly.
The color of the light depends on slight changes in the luciferase protein structure.
Nature’s cold-light system remains far more efficient than most human-made LEDs today.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Fireflies make light through a chemical reaction called bioluminescence, not heat. 萤火虫通过一种名为生物发光的化学反应发光，而非发热。
Because very little heat is produced, scientists call it 'cold light'. 由于产生的热量极少，科学家称其为‘冷光’。
Scientists study this reaction to develop safer medical imaging tools for humans. 科学家研究这一反应，以开发更安全的人体医学成像工具。

这篇中文题目最接近哪一句？萤火虫如何发出冷光？一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？萤火虫通过一种名为生物发光的化学反应发光，而非发热。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） How Do Fireflies Produce Cold Light? How to cook noodles A maths worksheet

Fireflies make light through a chemical reaction called bioluminescence, not heat.

Fireflies make light through a chemical reaction called bioluminescence, not heat.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Fireflies make light through a chemical reaction called bioluminescence, not heat.